16. A grouped frequency distribution table does not provide enough information t
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16. A grouped frequency distribution table does not provide enough information to obtain a complete listing of the original set of scores. 17. A professor records the number of students who are absent each day for the semester. Because this is a discrete variable, a bar graph should be used to show the frequency distribution. 18. A sports historian recorded the number of times that the New York Yankees finished 1st, 2d 3d and so on, in their division for the past 20 years. If the results are presented in a frequency distribution graph, then a histogram should be used. 19· The classrooms in the Psychology department are numbered from 100 to 108, A professor records the number of classes held in each room during the fall semester. If the results were presented in a frequency distribution graph, the professor should use a bar graph. 20. The normal distribution is an example of a symmetrical distribution. In February in New York, the daily high temperatures are typically low with only a few relatively warm days. A frequency distribution showing the daily high temperatures would probably form a negatively skewed distribution. 22. A student takes a 10-point quiz each week in statistics class. If the student's quiz scores for the first three weeks are 2,6, and 10, then the mean score is M 9 23. A sample of n 6 scores has2X-48. This sample has a mean of M = 8. 24. A sample with a mean of M-20 has X-120. There are, 6 scores in the sample 25· The mean is considered to be the··balance point" for a distribution because exactly half ofthe scores are located above the mean and exactly half are below the mean A sample has a mean of M = 40. If a new score of X-35 is added to the sample, then the sample 26, mean would increase. It is possible for a distribution to have more than one mode It is possible to have a distribution of scores where no individual has a score exactly equal to the 27. 28. mode 29. For a distribution with one or two extreme scores, the median is usually a more representative value than the mean. A distribution of scores has a mean of 50, a median of 53, and a mode of 56. Based on this information, it appears that the distribution is negatively skewed 30.Explanation / Answer
16) False: we can use grouped data for further calculations.
17) True
18) True
19) True
20) True: the normal distribution curve follows the principle of symmetry.
21) True
22) False: Mean score is equal to average of ( 2, 6, 10)
(2+6+10)/3= 6
Mean score is M = 6
23) True: M = 48/6
M = 8
24) True n = 120/20
n = 6
25) True
26) False:
suppose that n = 10,
Then the total sum of numbers would be 400.
if we add 35 to that, then the sum would be 435 and n = 11,
mean would be equal to 39.54, which is less than actual mean 40. this would apply to any value of 'n'
27) True
28) True, yes it is possible.
29) True. this is the reason why meadian is preferred over mean.
30) ????
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